From: Henning Schild henning.schild@siemens.com
[ Upstream commit c64964ebee2a415384385205950ee7a05f78451e ]
If we register a "leds-gpio" platform device for GPIO pins that do not exist we get a -EPROBE_DEFER and the probe will be tried again later. If there is no driver to provide that pin we will poll forever and also create a lot of log messages.
So check if that GPIO driver is configured, if so it will come up eventually. If not, we exit our probe function early and do not even bother registering the "leds-gpio". This method was chosen over "Kconfig depends" since this way we can add support for more devices and GPIO backends more easily without "depends":ing on all GPIO backends.
Fixes: a6c80bec3c93 ("leds: simatic-ipc-leds-gpio: Add GPIO version of Siemens driver") Signed-off-by: Henning Schild henning.schild@siemens.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Signed-off-by: Lee Jones lee@kernel.org Link: https://lore.kernel.org/r/20221007153323.1326-1-henning.schild@siemens.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/leds/simple/simatic-ipc-leds-gpio.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/leds/simple/simatic-ipc-leds-gpio.c b/drivers/leds/simple/simatic-ipc-leds-gpio.c index 07f0d79d604d4..e8d329b5a68c3 100644 --- a/drivers/leds/simple/simatic-ipc-leds-gpio.c +++ b/drivers/leds/simple/simatic-ipc-leds-gpio.c @@ -77,6 +77,8 @@ static int simatic_ipc_leds_gpio_probe(struct platform_device *pdev)
switch (plat->devmode) { case SIMATIC_IPC_DEVICE_127E: + if (!IS_ENABLED(CONFIG_PINCTRL_BROXTON)) + return -ENODEV; simatic_ipc_led_gpio_table = &simatic_ipc_led_gpio_table_127e; break; case SIMATIC_IPC_DEVICE_227G: